Because this is a very broad search term, it usually refers to one of three things. 1. Tax Forms and Legal Documents (Russia/CIS)
Many educational platforms offer these as "Electronic Educational Resources" (EOR). 3. Catalogues and Technical Manuals skachat pdf 2017
Automotive manuals (car repair guides) and furniture catalogues (like the 2017 IKEA catalogue) are frequently searched for in PDF format for archival purposes. Because this is a very broad search term,